ok ive got a few questions i need answers to.

1) does an open downpipe make more power + torque?
2) if an open downpipe is a good thing. im considering an electronic cutout from quicktime performance so i can turn it on and off when i goto the track. will i need a different tune to run an open downpipe? from what i understand the turbo spools up quicker with an open downpipe.


any responses are appreciated.

 

how much additional power, if any, is going to depend on your current exhaust

 

by what SR **** means is

if your current exhaust is free flowing and quite large, ( 3 inch) and your turbo isnt restricted by it, you will not make more power.

however, if you have a high flowing turbo and a setup that makes considerable amount of power, the gains seen by running open downpipe can be significant.


with an E-cutout, i suggest you tune with it open- especially in the pre-boost and boost columns because the way the vehicle runs with it closed or open will change the way your motor behaves and how the tune works with the motor

 

i used to have a 3" full exhaust, free flow hks dragger muffler. 3" inlet.
removed the exhaust on the dyno, no gains at all. but spool quicker a bit.
gt30 on 28psi